The S15 magazine is a patent-pending flush-fitting 15 round magazine for the Glock 43X and Glock 48. The S15 is a steel magazine and is the same length as the OEM Glock 10 round magazine but holds an additional 5 rounds. - Increased Capacity Same Reliability - Glock pistols and magazines are known for reliability -the S15 maintains that same Glock reliability while giving you a 50% increase in magazine capacity in the same overall footprint. - We accomplished this increased capacity with our patent-pending magazine geometry allowing the rounds to stagger thereby fitting more in the same amount of space. - Proudly made in the USA by Check-Mate. - Gen 2 Improvements - What changed with the gen 2 magazine? We made the following improvements: - Ambidextrous -mag catch cutout on both the left and right side - Smaller mag catch cutout windows - Improved magazine tube geometry - Improved baseplate geometry - Specifications - 15 round capacity - Same length as an OEM Glock 43X/48 magazine - Easy to remove impact resistant base pad - High lubricity finish Black Oxide coating - Made in the USA - Patent-pending - Powercron - Powercron is a cationic epoxy coating that offers excellent corrosion resistance and low VOC in a lead-free film electrocoat surface finish. If you are in a humid or salt water environment or if you sweat a lot we recommend Powercron Electroless Nickel or Black Electroless Nickel finish.